伤感

例句：

1. 1. She felt a deep sadness when she heard the news of her friend's death.
   当她听到朋友去世的消息时，她感到深深的悲伤。
2. 2.The sad music made me feel very lonely.
   悲伤的音乐让我感到非常孤独。
3. 3. Sadness can be caused by many different things, from loss of loved ones to personal failures.
   悲伤可以由许多不同的事情引起，从失去亲人到个人失败。